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| All Patents in class 409/281 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 828,425 | Aug. 14, 1906 | H.U. Ruedy | Tool for notching bung-holes | ||
| 2,002,924 | May 28, 1935 | E.G. Roehm, M. Romaine | Broaching Machine | ||
 | 2,551,359 | May 01, 1951 | M. Wahlstrom, R.F. Bannow | Slotting Machine Operating at Universal Angles in Overall Locations | |
| 3,881,398 | May 06, 1975 | V.J. Gravagne | Reciprocating Tool Attachment for Milling Machine | ||